一种新的基于虚振荡器的分相解耦控制和改善不平衡故障穿越性能的网格形成控制器
A New Virtual Oscillator based Grid-forming Controller with Decoupled Control Over Individual Phases and Improved Performance of Unbalanced Fault Ride-through
摘要：
虚拟振荡器（VO）控制是并网逆变器的最新控制技术。VO控制器（VOC）提供与连接的电网的时域同步。同时，VOC可以包含额外的嵌套控制回路，以满足系统级要求，例如故障穿越能力。然而，现有的VOC有两个局限性。首先，现有的VOC不具有对各个相的解耦控制。因此，现有VOC的性能在存在不平衡电网电压的情况下不令人满意。其次，现有的挥发性有机化合物在不平衡故障下的故障穿越性能不令人满意。故障相严重影响健康相的功率运行。本文介绍了一种改进的基于VO的系统级网格形成控制器，以克服上述局限性。提出了系统的发展与分析推理的控制体系结构。仿真研究和硬件实验进行验证。
英文摘要：
Virtual Oscillator (VO) control is the latest and promising control technique for grid-forming and grid-supporting inverters. VO Controllers (VOCs) provide time-domain synchronization with a connected electrical network. At the same time, a VOC can incorporate additional nested control loops to meet the system-level requirements such as fault ride-through capability. However, existing VOCs have two limitations. Firstly, the existing VOCs do not have decoupled control over individual phases. As a result, the performance of the existing VOCs is not satisfactory in presence of unbalanced grid voltages. Secondly, the fault ride-through performance of the existing VOCs under unbalanced faults is not satisfactory. The power operation at a healthy phase is badly affected by a faulty phase. This paper has introduced a modified VO based system-level grid-forming controller to overcome the limitations mentioned above. Systematic development of the proposed control architecture with analytical reasoning is presented. Simulation studies and hardware experiments are conducted for validation.
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